He attended Colorado College in Colorado Springs, Colorado, where he studied philosophy, biology, fine arts and German, the last of which he studied overseas for a year at the University of Goettingen.[10] He was involved in local theater productions and singing groups. After graduating with a BA in philosophy, he was involved in many community theatre projects, including a sketch movie that aired on local public television.[7]

Baker moved to Orlando in 1989 to work on an improv sketch comedy show titled "The Anacomical Players" at EPCOT Center's Wonders of Life pavilion and joined various projects for Disney and Universal Studios.[4][7][11] His first major experience on national television was on the Nickelodeon game show Legends of the Hidden Temple, where he was not only the announcer, but also the giant talking rock-god Olmec.[7][12] He portrayed Olmec with a "big, booming, loud, god-like voice". During parts of the show, he would narrate a legend, and then ask the kid contestants related trivia questions. The show lasted three seasons and 120 episodes. When host Kirk Fogg moved to Los Angeles, he was encouraged to move there as well.[13] In 2016, he and Fogg reprised their roles for a live action television movie adaptation of the show.[14]

In 2007, Baker got the role of Perry the Platypus in the Disney series Phineas and Ferb. At the San Diego Comic-Con 2013 panel, Baker mentioned that when he auditioned, he was asked to provide three different creature sounds, regardless of whether it actually sounded like a platypus, of which one was selected as Perry's characteristic sound.[39] Perry has become a breakout character for the series,[40] with Baker appearing at multiple Comic-Con panels for the show.[39] In 2014, Perry was nominated for a Nickelodeon Kids' Choice Award for Best Animal Sidekick. Coincidentally, another one of Baker's voiced characters, Waddles the pet pig in Gravity Falls, was nominated for the same category.[41]

In the video game world, Baker reprised his roles in Cartoon Network and Nickelodeon's multitude of show-related game releases. He also voiced Gravemind in Halo 2 and Halo 3[22] and the title character Joe in the Viewtiful Joe series released from 2003 to 2005.[59] He provided the creature sounds for the Spore video game which allows players to create and evolve their own creatures.[60][61] At San Diego Comic-Con 2008's opening night, he was a featured performer at the Video Games Live concert, where he voiced characters from Gears of War and other series.[62]

Baker has appeared on various panels at Comic-Con and other conventions where he talks about voice acting in general.[69] He hosts a website where he answers frequently-asked questions about voice acting.[2] The site has been cited by fellow voice actors Steve Blum and Rob Paulsen as a valuable resource for getting into voice acting.[70][71]

Baker met his wife, Michelle, when they were doing children's theatre at the Colorado Springs Fine Arts Center. They were married in 1990 and have two daughters: Josie and Cora.[6][7] They live in the Los Angeles area. Outside of voice acting, Baker enjoys photography,[72] taking pictures of mostly little flowers and insects.[2]